feat: rewording and adjust button size

web/src/app/_components/messages-block.tsx

@@ -133,7 +133,7 @@ export function MessagesBlock({ className }: { className?: string }) {
                           ? "DeerFlow is now replaying the conversation..."
                           : replayStarted
                             ? "The replay has been stopped."
-                            : `You're now in DeerFlow's replay mode. Click the "Start" button on the right to replay.`}
+                            : `You're now in DeerFlow's replay mode. Click the "Play" button on the right to start.`}
                       </RainbowText>
                     </CardDescription>
                   </CardHeader>
@@ -150,9 +150,9 @@ export function MessagesBlock({ className }: { className?: string }) {
                     </Button>
                   )}
                   {!replayStarted && (
-                    <Button onClick={handleStartReplay}>
+                    <Button className="w-24" onClick={handleStartReplay}>
                       <Play size={16} />
-                      Start
+                      Play
                     </Button>
                   )}
                 </div>